CN114875401A - Surface modification method for gear shaft of high-pressure hydraulic pump - Google Patents
Surface modification method for gear shaft of high-pressure hydraulic pump Download PDFInfo
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- 238000002715 modification method Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000004372 laser cladding Methods 0.000 claims abstract description 23
- 238000005496 tempering Methods 0.000 claims abstract description 21
- 238000003754 machining Methods 0.000 claims abstract description 17
- 238000010791 quenching Methods 0.000 claims abstract description 14
- 230000000171 quenching effect Effects 0.000 claims abstract description 14
- 238000005253 cladding Methods 0.000 claims description 31
- 239000000843 powder Substances 0.000 claims description 30
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 239000002131 composite material Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 8
- 229910001339 C alloy Inorganic materials 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
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- 229910052742 iron Inorganic materials 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000010410 layer Substances 0.000 abstract description 47
- 239000011248 coating agent Substances 0.000 abstract description 19
- 238000000576 coating method Methods 0.000 abstract description 19
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052804 chromium Inorganic materials 0.000 abstract description 13
- 239000011651 chromium Substances 0.000 abstract description 13
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- 238000010438 heat treatment Methods 0.000 abstract description 9
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- 238000007747 plating Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a surface modification method for a gear shaft of a high-pressure hydraulic pump, belonging to the technical field of mechanical parts. The technical scheme is as follows: after quenching, high-temperature tempering and rough machining of a hydraulic pump gear shaft part blank, preparing a Mo/C/Fe bonding layer and a Mo2FeB2/Mo working layer on the surface of the part by adopting a laser cladding method, and then performing stress relief tempering, semi-finishing and finishing. The surface modification method can enhance the adhesion performance of the laser cladding layer and the substrate, and improves the binding force by more than 1 time compared with the traditional chromium coating layer/substrate; the surface hardness of the part reaches more than HV1600, the hardness is improved by 2 times compared with the traditional heat treatment, the hardness is improved by 1.5-2 times compared with the traditional chromium coating, the wear resistance and the corrosion resistance of the part are improved by more than 3 times, the frictional wear in the working process is reduced by more than 50%, the service life of a gear shaft of the hydraulic pump is prolonged by 3-4 times, and the maintenance cost of the hydraulic pump is reduced by more than 70%.
Description
Technical Field
The invention relates to the technical field of mechanical part manufacturing, in particular to a surface modification method for a gear shaft of a high-pressure hydraulic pump.
Background
The hydraulic pump is a power element of the hydraulic transmission system, and is used for converting mechanical energy of a power machine (such as a motor, an internal combustion engine and the like) into hydraulic energy of oil and providing power for the whole hydraulic system. With the rapid development of industrial technology, hydraulic pumps are gradually developing towards high pressure, high speed and large flow. Because the hydraulic pump still must bear the high and concentrated alternating load effect while running at a high speed, the part wearing and tearing in the pump is the main damage form of domestic hydraulic pump especially high-pressure hydraulic pump, therefore, improve the performance of hydraulic pump part material and be one of the key technology of development high pressure, high-speed hydraulic pump.
Because the working condition of the high-pressure hydraulic pump is extremely severe, the main failure modes of the hydraulic pump gear shaft are fatigue wear and erosion wear, and in order to improve the surface comprehensive performance of the high-pressure hydraulic pump gear shaft, the wear resistance and the reliability of the gear shaft are improved by generally adopting the ways of reducing the stress of the gear shaft in unit area and improving the strength of the gear shaft in unit area. However, the size of the gear shaft is increased to reduce the surface stress of the gear shaft, so that the volume and the weight of the whole hydraulic pump are increased, and the feasibility of the hydraulic pump with strict requirements on the whole structure and the size is low; the most widely used surface treatment methods at present are surface chromium plating and heat treatment methods of quenching and low-temperature tempering. The chromium plating is carried out on the surface of the chromium plating to improve the wear resistance and the corrosion resistance of the surfaces of parts such as a gear shaft and the like, but the chromium plating layer prepared by the method at present has poor combination property with a base body, is easy to generate peeling and bulge in the using process, has the service life and the wear resistance which can not meet the normal use requirements, and has the effective service life of only 1 to 2 years. The heat treatment method of quenching and low-temperature tempering causes the surface of the workpiece to generate larger deformation, and the size and shape precision of the part cannot be ensured. Therefore, the development of a new preparation process or method is of great significance to prolong the service life of the hydraulic pump.
Because boride ceramics have excellent characteristics such as high hardness, corrosion resistance, and wear resistance, it is expected that the surface properties and the use effects of parts can be improved by preparing a boride ceramic coating on the surface of the parts.
The prior art for preparing boride coating mainly comprises methods such as spraying, vapor deposition, laser surface deposition and the like. The spraying is that the coating material is sprayed to the surface of a workpiece by means of pressure or centrifugal force, the coating prepared by the method has high spraying efficiency, but the bonding force between the coating and a workpiece substrate is poor, the surface of the coating is very rough, and the coating is not suitable for severe working conditions of high pressure and high speed; the surface of the prepared coating has extremely high hardness and strength, and good thermal stability and wear resistance, and the temperature of the preparation process can be controlled below 400 ℃, so that the change of the matrix structure of the part is avoided, and the surface size and the shape precision are not influenced. However, the carbide coating prepared by directly preparing the surface modification method of the PV high-pressure hydraulic pump gear shaft on the surface of the hydraulic pump part cannot obtain a boride coating with high bonding force due to larger differences of performances such as matrix hardness, elastic modulus, thermal expansion coefficient and the like with coating materials, so that the boride coating falls off and fails early, and therefore, the method more suitable for preparing the boride coating is to be further researched and developed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for modifying the surface of the gear shaft of the high-pressure hydraulic pump overcomes the defects of the prior art, can obviously improve the surface performance of the gear shaft of the high-pressure hydraulic pump, improves the wear resistance and corrosion resistance of gear shaft parts, effectively prolongs the service life of the gear shaft of the hydraulic pump, prolongs the maintenance period and the service life of products, and reduces the use and maintenance cost of the hydraulic pump.
The technical scheme of the invention is as follows: a surface modification method for a high-pressure hydraulic pump gear shaft is characterized in that a blank of a hydraulic pump gear shaft part is subjected to quenching, high-temperature tempering and rough machining, a Mo/C/Fe bonding layer and a Mo2FeB2/Mo working layer are prepared on the surface of the part by a laser cladding method, and then stress relief tempering, semi-finishing and finishing are carried out, and the method specifically comprises the following steps:
(1) machining a gear shaft part of the hydraulic pump: quenching a gear shaft part substrate blank → high-temperature tempering → rough machining;
(2) pretreatment of the surfaces of gear shaft parts of a hydraulic pump: removing oil stains and oxidation films on the surface of the workpiece, rinsing and drying;
(3) cladding Mo/C/Fe bonding layer: introducing argon protective gas with the flow rate of 13-16L/min; laser cladding Mo/C/Fe bonding layer, the cladding technological parameters are as follows: the laser power is 1300-1600W, the scanning speed is 180-210mm/min, the spot diameter of the laser is 1.6-2.2mm, the lap joint rate is 40-45%, and the cladding thickness is 0.2-0.4 mm;
(4) cladding Mo2FeB2/Mo working layer: introducing argon protective gas with the flow rate of 22L/min-25L/min; laser cladding Mo2FeB2/Mo working layer, the cladding technological parameters are as follows: the laser power is 2300-;
(5) and (3) post-treatment: after the workpiece is cooled, the stress relief tempering → the semi-finishing → the finishing are carried out.
Preferably, the base material of the hydraulic pump gear shaft part is one of 35CrMo or 42CrMo carbon alloy steel.
Preferably, Mo, C and Fe composite powder is used for cladding the Mo/C/Fe bonding layer in the step (3), the diameter of the powder particles is 20-50nm, and the weight percentages are respectively as follows: 20-25%, 30-35% and 40-50%.
Preferably, the Mo/C/Fe powder used for cladding the Mo/C/Fe bonding layer in the step (3) is ground and mixed by a ball mill for 100-120 min.
Preferably, the Mo2FeB2/Mo working layer is clad in step (4) by using a composite powder of Mo and Mo2FeB2, the particle diameter of the Mo2FeB2 powder is 50-80nm, the particle diameter of the Mo powder is 20-50nm, and the weight percentages of the Mo2FeB2 and the Mo powder are respectively: 60-70% and 30-40%.
Preferably, the Mo and Mo2FeB2 composite powder used for cladding the Mo2FeB2/Mo working layer in the step (4) is ground and mixed by a ball mill for 150 min.
According to the invention, the surface modification method of the hydraulic pump gear shaft is carried out by a laser cladding method, the Mo2FeB2/Mo composite coating, the laser cladding technology and the surface heat treatment technology are combined, and the Mo/C/Fe metal composite bonding layer is prepared on the surface of the workpiece by the laser cladding method, so that the performance difference between the subsequent working layer and the gear shaft part base material can be relieved, the matching performance of the structure and the performance between the subsequent working layer and the gear shaft part base material can be improved, and the bonding performance between the laser cladding layer/the base material and the impact resistance of the working layer can be improved. In the clad Mo2FeB2/Mo working layer, the Mo2FeB2 boride cladding layer has extremely high hardness, excellent corrosion resistance, chemical stability and friction and wear resistance, and can improve the wear resistance and corrosion resistance of the surface of a part; the addition of Mo element plays a role in solid solution strengthening, so that the frictional wear performance of the surface cladding layer is improved, and the actual use performance and effect of the laser cladding layer are improved.
Compared with the prior art, the invention has the following beneficial effects:
the surface modification method can enhance the adhesion performance of the laser cladding layer and the substrate, and improves the binding force (40-50N) of the traditional chromium coating layer/substrate by more than 1 time; the surface hardness of the part reaches more than HV1600, the hardness (HV500-550) is improved by 2 times compared with the hardness (HV500-550) of the traditional heat treatment (quenching and low-temperature tempering), the hardness (HV 670-750) of the chromium coating is improved by 1.5-2 times compared with the hardness of the traditional chromium coating, the wear resistance and the corrosion resistance of the part are improved by more than 3 times, the frictional wear in the working process is reduced by more than 50%, the service life of a gear shaft of a hydraulic pump is prolonged by 3-4 times, and the maintenance cost of the hydraulic pump is reduced by more than 70%.
Drawings
Fig. 1 is a schematic view of the surface structure of a gear shaft part of a hydraulic pump prepared in embodiment 1 of the present invention.
FIG. 2 is a surface hardness test curve of a gear shaft part of the hydraulic pump prepared in example 1 of the present invention.
FIG. 3 is a test curve of a scratch test of a gear shaft part of a hydraulic pump prepared in example 1 of the present invention.
In the figure, 1, a gear shaft part base body; 2. a Mo/C/Fe bonding layer; 3. mo2FeB2/Mo working layer.
Detailed Description
Example 1
The embodiment provides a surface modification method for a hydraulic pump gear shaft, wherein the base material of the hydraulic pump gear shaft is 35CrMo medium carbon alloy steel. After quenching, high-temperature tempering and rough machining of the gear shaft part blank, preparing a Mo/C/Fe bonding layer and a Mo2FeB2/Mo working layer on the surface of the part by adopting a laser cladding method, and then performing stress relief tempering, semi-finishing and finishing.
The method specifically comprises the following steps:
(1) machining a gear shaft: gear shaft part substrate blank → quenching (830-;
(2) pretreatment of the surface of the part: removing oil stains and oxidation films on the surfaces of the parts, and drying the parts in a heating furnace;
(3) preparing Mo/C/Fe composite powder: the composite powder of Mo, C and Fe is adopted, the particle diameter of the powder is 25nm, and the weight percentages are as follows: 20%, 30% and 50%, and the mixing time was 110min by ball mill milling.
(4) Preparing Mo2FeB2/Mo composite powder: the Mo2FeB2 and Mo composite powder is adopted, the particle diameter of the Mo2FeB2 powder is 65nm, and the Mo2FeB2 and the Mo powder respectively comprise the following components in percentage by weight: 60 percent and 40 percent, and the grinding and mixing time by a ball mill is 120 min.
(5) Cladding Mo/C/Fe bonding layer: introducing argon protective gas with the flow rate of 15L/min; laser cladding Mo/C/Fe bonding layer, the cladding technological parameters are as follows: the laser power is 1300-1600W, the scanning speed is 200mm/min, the spot diameter of the laser is 1.8-2.0mm, the lap joint rate is 40-42%, and the cladding thickness is 0.2-0.3 mm;
(6) cladding Mo2FeB2/Mo working layer: introducing argon protective gas with the flow rate of 22L/min-25L/min; laser cladding Mo2FeB2/Mo working layer, the cladding technological parameters are as follows: the laser power 2300-2500W, the scanning speed 260-270mm/min, the spot diameter of the laser 2.6-3.0mm, the lap joint rate 25-35% and the cladding thickness 2-3 mm;
(7) and (3) post-treatment: after the gear shaft workpiece is cooled, stress relief tempering (520-570 ℃, air cooling) → lathe semi-finishing (surface roughness Ra1.6-3.2 μm, machining size to tolerance lower limit) → grinder finishing (surface roughness Ra0.8-1.6 μm, machining size to tolerance lower limit) → gear shaft surface grinding (surface roughness Ra0.4-0.8 μm, machining size to tolerance upper limit).
Referring to fig. 1, the gear shaft part of the hydraulic pump manufactured in the present embodiment has the following structure: the surface of the part base body 1 is provided with a Mo/C/Fe bonding layer 2 and a Mo2FeB2/Mo working layer 3 in sequence from the outside.
According to the laser cladding Mo2FeB2/Mo composite layer prepared in the embodiment, a surface hardness test curve is shown in FIG. 2 (test equipment: FISCERSCOPE HM2000S nanometer indentation hardness tester), the measured surface microhardness reaches HV1650-1720, is more than 3 times of the surface hardness (HV500-550) of the traditional heat treatment (quenching and low temperature tempering) process, and is more than 2 times of the hardness (HV 670-750) of the traditional chromium coating; the test curve of the bonding force scratch test is shown in figure 3, (test equipment: MFT-4000 multifunctional material surface property tester), the measured bonding strength of the cladding layer and the part substrate reaches 100-120N, and the bonding force is improved by more than 1 time compared with the traditional chromium coating/substrate bonding force (40-50N). Under the same friction experiment conditions (a ball disc friction wear testing machine performs reciprocating linear motion, a WC ball with the surface hardness of 15GPa is used as a grinding ball, the loading load is 80N, the friction speed is 6mm/s, and the grinding time is 30min), the wear rate of the laser cladding Mo2FeB2/Mo layer prepared by the method is only 1.57-1.74 multiplied by 10 -6 mm 3 N.m, the wear rate of the chromium-plated part is reduced by 70-80% compared with the wear rate of the traditional chromium-plated part.
Example 2
The embodiment provides a surface modification method for a hydraulic pump gear shaft, wherein the base material of the hydraulic pump gear shaft is 42CrMo medium carbon alloy steel. After quenching, high-temperature tempering and rough machining of a gear shaft part substrate, preparing a Mo/C/Fe bonding layer and a Mo2FeB2/Mo working layer on the surface of the part by adopting a laser cladding method, and then performing stress relief tempering, semi-finishing and finishing.
The method specifically comprises the following steps:
(1) machining a gear shaft: gear shaft part substrate blank → quenching (840-;
(2) pretreatment of the surface of the part: cleaning oil stains and oxidation films on the surfaces of the parts, and drying the parts in a heating furnace;
(3) preparing Mo/C/Fe composite powder: the composite powder of Mo, C and Fe is adopted, the diameter of the powder particles is 40nm, and the weight percentages are as follows: 25%, 35% and 40%, grinding and mixing time by ball mill is 120 min.
(4) Preparing Mo2FeB2/Mo composite powder: the composite powder of Mo2FeB2 and Mo is adopted, the particle diameter of the Mo2FeB2 powder is 80nm, and the weight percentages of the Mo2FeB2 and the Mo powder are respectively as follows: 65% and 35%, grinding and mixing for 140min by a ball mill.
(5) Cladding Mo/C/Fe bonding layer: introducing argon protective gas with the flow rate of 15-16L/min; laser cladding Mo/C/Fe bonding layer, the cladding technological parameters are as follows: the laser power is 1400-;
(6) cladding Mo2FeB2/Mo working layer: introducing argon protective gas with the flow rate of 22L/min-25L/min; laser cladding Mo2FeB2/Mo working layer, the cladding technological parameters are as follows: the laser power is 2500-;
(7) and (3) post-treatment: after the gear shaft workpiece is cooled, stress relief tempering (510-580 ℃, air cooling) → lathe semi-finishing (surface roughness Ra1.6-3.2 μm, machining size to lower tolerance limit) → grinding machine finish (surface roughness Ra0.8-1.6 μm, machining size to lower tolerance limit) → gear shaft surface grinding (surface roughness Ra0.4-0.8 μm, machining size to required tolerance range) is carried out.
The microhardness of the surface of the Mo2FeB2/Mo laser cladding layer prepared by the embodiment reaches HV1710-1770, is increased by more than 2 times compared with the surface hardness (HV470-494) of the traditional heat treatment (quenching and low-temperature tempering) process, and is increased by more than 1 time compared with the hardness (HV 670-740) of the traditional chromium coating; the bonding strength of the cladding layer and the part substrate reaches 100-130N, which is improved by more than 1.5 times compared with the traditional chromium coating layer/substrate bonding force (40-50N). The cladding layer can still keep a good working state after continuously rubbing for 4 hours (the load is 80N, the rubbing speed is 10 mm/s) under the heavy load condition, and the cladding layer is completely worn off after 0.5 hour of rubbing under the same condition of the traditional chromium-plated part.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A surface modification method for a high-pressure hydraulic pump gear shaft is characterized in that a blank of a hydraulic pump gear shaft part is subjected to quenching, high-temperature tempering and rough machining, a Mo/C/Fe bonding layer and a Mo2FeB2/Mo working layer are prepared on the surface of the part by a laser cladding method, and then stress relief tempering, semi-finishing and finishing are carried out;
the method specifically comprises the following steps:
(1) machining a gear shaft part of the hydraulic pump: quenching a base body blank of the hydraulic pump gear shaft part → high-temperature tempering → rough machining;
(2) pretreatment of the surfaces of gear shaft parts of a hydraulic pump: removing oil stains and oxidation films on the surface of the workpiece, rinsing and drying;
(3) cladding Mo/C/Fe bonding layer: introducing argon protective gas with the flow rate of 13-16L/min; laser cladding Mo/C/Fe bonding layer, the cladding technological parameters are as follows: the laser power is 1300-1600W, the scanning speed is 180-210mm/min, the spot diameter of the laser is 1.6-2.2mm, the lap joint rate is 40-45%, and the cladding thickness is 0.2-0.4 mm;
(4) cladding Mo2FeB2/Mo working layer: introducing argon protective gas with the flow rate of 22L/min-25L/min; laser cladding Mo2FeB2/Mo working layer, the cladding technological parameters are as follows: the laser power is 2300-;
(5) and (3) post-treatment: after the workpiece is cooled, the stress relief tempering → the semi-finishing → the finishing are carried out.
2. The surface modification method of a high-pressure hydraulic pump gear shaft according to claim 1, wherein the base material of the hydraulic pump gear shaft part is one of 35CrMo or 42CrMo carbon alloy steel.
3. The surface modification method of the gear shaft of the high-pressure hydraulic pump, as claimed in claim 1, wherein the Mo/C/Fe bonding layer is clad in step (3) using Mo, C and Fe composite powder, the diameter of the powder particles is 20-50nm, and the weight percentages are respectively: 20-25%, 30-35% and 40-50%.
4. The method for modifying the surface of the gear shaft of the high-pressure hydraulic pump as claimed in claim 3, wherein the Mo/C/Fe powder used for cladding the Mo/C/Fe bonding layer in the step (3) is ground and mixed by a ball mill for 100-120 min.
5. The surface modification method for the gear shaft of the high-pressure hydraulic pump, as claimed in claim 1, wherein the Mo2FeB2/Mo working layer clad in step (4) is a composite powder of Mo and Mo2FeB2, the particle diameter of the Mo2FeB2 powder is 50-80nm, the particle diameter of the Mo powder is 20-50nm, and the weight percentages of the Mo2FeB2 and the Mo powder are respectively: 60-70% and 30-40%.
6. The surface modification method of the gear shaft of the high-pressure hydraulic pump as claimed in claim 5, wherein the Mo and Mo2FeB2 composite powder used for cladding the Mo2FeB2/Mo working layer in the step (4) is ground and mixed for 120-150min by a ball mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210698052.5A CN114875401B (en) | 2022-06-20 | 2022-06-20 | Surface modification method for high-pressure hydraulic pump gear shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210698052.5A CN114875401B (en) | 2022-06-20 | 2022-06-20 | Surface modification method for high-pressure hydraulic pump gear shaft |
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| CN103060707A (en) * | 2013-01-01 | 2013-04-24 | 北京工业大学 | Coating material for replacing hard chromium plating and laser-cladding preparation method thereof |
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| CN109112381A (en) * | 2018-10-29 | 2019-01-01 | 山东大学 | A kind of built-up welding cermet powder agglomates |
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| CN113930760A (en) * | 2021-09-28 | 2022-01-14 | 西安迈瑞驰石油科技有限公司 | Laser cladding boride-based wear-resistant coating and preparation method and application thereof |
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| CN103060707A (en) * | 2013-01-01 | 2013-04-24 | 北京工业大学 | Coating material for replacing hard chromium plating and laser-cladding preparation method thereof |
| CN108971800A (en) * | 2018-10-29 | 2018-12-11 | 山东大学 | A kind of antiwear heat resisting built-up welding cermet welding rod |
| CN109112381A (en) * | 2018-10-29 | 2019-01-01 | 山东大学 | A kind of built-up welding cermet powder agglomates |
| CN111235456A (en) * | 2020-03-11 | 2020-06-05 | 山东大学 | Ternary boride and carbide reinforced metal ceramic powder for laser cladding additive manufacturing, and preparation and application thereof |
| CN113930760A (en) * | 2021-09-28 | 2022-01-14 | 西安迈瑞驰石油科技有限公司 | Laser cladding boride-based wear-resistant coating and preparation method and application thereof |
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| HAO ZHANG ET AL.: "The influence of powder size on the microstructure and properties of Mo2FeB2 coating fabricated via laser cladding with pre‑placed powder", 《THE INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY》, vol. 120, pages 6041 - 6052, XP037843836, DOI: 10.1007/s00170-022-09105-3 * |
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